Mesa (master): mesa/st: recognize no-op scissor state when checking clear_with_quads

[Brian Paul]

Module: Mesa
Branch: master
Commit: 2420b283b783751d4def3a3a2a0ed8bf7bb7b6a8
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2420b283b783751d4def3a3a2a0ed8bf7bb7b6a8

Author: Keith Whitwell <keithw at vmware.com>
Date:   Tue Jul 28 18:45:22 2009 +0100

mesa/st: recognize no-op scissor state when checking clear_with_quads

Some apps enable scissor but set the rectangle to the dimensions of
the window.  Don't let this force us onto a slower clear path.

---

 src/mesa/state_tracker/st_cb_clear.c |   24 ++++++++++++++++++++----
 1 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/mesa/state_tracker/st_cb_clear.c b/src/mesa/state_tracker/st_cb_clear.c
index 668acbc..8a8c99f 100644
--- a/src/mesa/state_tracker/st_cb_clear.c
+++ b/src/mesa/state_tracker/st_cb_clear.c
@@ -280,7 +280,11 @@ clear_with_quad(GLcontext *ctx,
 static INLINE GLboolean
 check_clear_color_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
 {
-   if (ctx->Scissor.Enabled)
+   if (ctx->Scissor.Enabled &&
+       (ctx->Scissor.X != 0 ||
+        ctx->Scissor.Y != 0 ||
+        ctx->Scissor.Width < rb->Width ||
+        ctx->Scissor.Height < rb->Height))
       return TRUE;
 
    if (!ctx->Color.ColorMask[0] ||
@@ -300,7 +304,11 @@ check_clear_depth_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
    GLboolean maskStencil
       = (ctx->Stencil.WriteMask[0] & stencilMax) != stencilMax;
 
-   if (ctx->Scissor.Enabled)
+   if (ctx->Scissor.Enabled &&
+       (ctx->Scissor.X != 0 ||
+        ctx->Scissor.Y != 0 ||
+        ctx->Scissor.Width < rb->Width ||
+        ctx->Scissor.Height < rb->Height))
       return TRUE;
 
    if (maskStencil)
@@ -319,7 +327,11 @@ check_clear_depth_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
    const struct st_renderbuffer *strb = st_renderbuffer(rb);
    const GLboolean isDS = pf_is_depth_and_stencil(strb->surface->format);
 
-   if (ctx->Scissor.Enabled)
+   if (ctx->Scissor.Enabled &&
+       (ctx->Scissor.X != 0 ||
+        ctx->Scissor.Y != 0 ||
+        ctx->Scissor.Width < rb->Width ||
+        ctx->Scissor.Height < rb->Height))
       return TRUE;
 
    if (isDS && 
@@ -345,7 +357,11 @@ check_clear_stencil_with_quad(GLcontext *ctx, struct gl_renderbuffer *rb)
    if (maskStencil) 
       return TRUE;
 
-   if (ctx->Scissor.Enabled)
+   if (ctx->Scissor.Enabled &&
+       (ctx->Scissor.X != 0 ||
+        ctx->Scissor.Y != 0 ||
+        ctx->Scissor.Width < rb->Width ||
+        ctx->Scissor.Height < rb->Height))
       return TRUE;
 
    /* This is correct, but it is necessary to look at the depth clear